Nonlinear collisionless damping of Weibel turbulence in relativistic blast waves - Archive ouverte HAL Access content directly
Journal Articles Journal of Plasma Physics Year : 2015

Nonlinear collisionless damping of Weibel turbulence in relativistic blast waves

(1)
1
Martin Lemoine

Abstract

The Weibel/filamentation instability is known to play a key role in the physics of weakly magnetized collisionless shock waves. From the point of view of high energy astrophysics, this instability also plays a crucial role because its development in the shock precursor populates the downstream with a small-scale magneto-static turbulence which shapes the acceleration and radiative processes of suprathermal particles. The present work discusses the physics of the dissipation of this Weibel-generated turbulence downstream of relativistic collisionless shock waves. It calculates explicitly the first-order nonlinear terms associated to the diffusive nature of the particle trajectories. These corrections are found to systematically increase the damping rate, assuming that the scattering length remains larger than the coherence length of the magnetic fluctuations. The relevance of such corrections is discussed in a broader astrophysical perspective, in particular regarding the physics of the external relativistic shock wave of a gamma-ray burst.

Dates and versions

insu-03644787 , version 1 (19-04-2022)

Identifiers

Cite

Martin Lemoine. Nonlinear collisionless damping of Weibel turbulence in relativistic blast waves. Journal of Plasma Physics, 2015, 81, ⟨10.1017/S0022377814000920⟩. ⟨insu-03644787⟩
3 View
0 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More